Interesting, I found it extremely intuitive, have completed a map, published it and made it available only to steam friends list. Took me about 20 mins from loading it to publishing it, without having used it before.

Getting a mate to see it however was not so easy, but eventually we got there.

Managed to see your map red_one, and play it. Can you see if my map shows up in your list, name starts with MadMax?

To make the chamber bigger or smaller, move an entire wall by left-clicking one corner tile, then hold down shift and click the diagonally opposite tile to select the entire wall, and then press either + or - on your keyboard until it is right.

Create "tunnels" by selecting one or 2 or 4 or how ever many tiles you want and do the same, to the floor or wall or ceiling.

Why does a button connected to a laser only work on the first click? For example, you set it to be on in the beginning, and if you click the connected button in the game it goes off, and you can't press the button again to turn it back on.